getChildInfos()
Return the all ChildInfos of the node represent by
this info, an empty iterator if that node doesn't have any child nodes
or null if the implementation is not able or for some
internal reasons not willing to compute the ChildInfo
iterator.

getMixins

Array of Names representing the names of mixin nodetypes.
This includes only explicitly assigned mixin nodetypes. It does not include
mixin types inherited through the addition of supertypes to the primary
type hierarchy. If there are no mixin node types assigned an empty
array will be returned.

getChildInfos

Return the all ChildInfos of the node represent by
this info, an empty iterator if that node doesn't have any child nodes
or null if the implementation is not able or for some
internal reasons not willing to compute the ChildInfo
iterator. In the latter case the user of this API must call
RepositoryService.getChildInfos(SessionInfo, NodeId) in order
to determine the existence and identity of the child nodes.

An iterator of ChildInfos or null if
the implementation is not able or willing to compute the set of
ChildInfos (e.g. an implementation may choose to return
null if there is a huge amount of child nodes). In this
case RepositoryService.getChildInfos(SessionInfo, NodeId) will
be used to load the ChildInfos.